Analysis of genetic diversity and contribution of yield components towards total diversity in Indian mustard [Brassica juncea (Linn.) Czern & coss]

摘要

Mahalanobis's D~2 statistics was applied to assess the genetic divergence of 36 genotypes of Indian mustard [Brassica juncea (Linn.) Czern & coss] selected form different geographical regions. These genotypes were grouped into nine clusters among which cluster II included the largest number of 17 genotypes followed by cluster I with 7 genotypes, cluster III with 5 and cluster VI with 2 genotypes. Five clusters namely IV, V VII VIII and IX had single genotypes each. The maximum divergence was revealed between cluster III and V, whereas, it was minimum between cluster VI and IV. The cluster II and V were also distantly placed from the other 7 clusters. Genotypes from divergent clusters should be considered for hybridization rather than those genotypes from the same cluster or minimum divergent clusters. Diverse genotypes can also be used for conversion in male background for exploiting heterosis. Also one male sterile line was in a distinct cluster and can contribute to high heterosis.